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THOMAS S. SARNEY, OF OAMBERWELL, AND JOHN M. ALPROVIDGE, OF HERNE HILL, COUNTY OF SURREY, ENG-LAND.

SECONDARY BATTERY.

EBPECIPICATION forming part of Letters Patent No. 302,783, dated July 29, 1884.

Application filed August 16, 1882.

(No specimens.) Patented in England July 8, 1882, No. 3,240; in France July 17, 1.882, No. 150,146;

in Germany July 19, 1882, No. 25,155, and in Canada September 7, 1882, No. 15AM.

2"0 aZZ whom, it may concern.-

Be it known that we, Tnoiulls SEx'roN SAR- NEY, of (lamberwell, in the county ofSurrey, in the kingdom of Great Britain, and JOHN llloivnicnn ALPROVIDGE, of Herne Hill, in said county and Kingdom, have invented certain new and useful Improvements in Second ary Batteries; and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to the manufacture and formation of plates which are suitable for nscin electric accumulators or secondary batteries.

The invention consists in making said plates of thin laminated metallic sheets, in or with which are intimately commingled an1algamated or impregnated lead or other suitable metallic oxides, peroxides, or sulphates, or other suit-able substances, all as hereinafter described, the object being to expose the largest possible amount of surface (with a given weight of material) to the action of the bath.

Various methods maybe employed for carrying this invention into eifect-as, for eXample, by rolling down to a thin sheet a thick metal plate, which has been previously coated with a paste or mixture of lead or other are tallic oxides, peroxides, or sulphates, after which the plate is again coated with the paste or mixture, and is doubled back on itself, passed through the rolls, again coated, doubled, and rolled until the size, quantity, and degree of impregnation required have been obtaineda Instead of rolling the plates, they may be made by paddling the molten metal with the metallicoxides, peroxides, sulphates, or other suitable 1naterialsueh as carbon, coke, or manganese the mixture being subsequently cast or molded, coated, rolled, and laminated, as above described.

Instead of puddling, the ingredients may be blown into or upon the molten metal in a manncr analogous to that which has been proposed for the treatment of steel in the Bessemer or other converter or furnace. \Vliatever the method employed, it is intended that the metal should be coated and laminated by rolling or by other suitable methods until a large amount of surface is exposed, with but comparative] y a small weight of combined and thoroughly impregnated or inclosed material.

In order to keep the thin sheets from absolutely touching, paper, felt, or other suitable porous material is interposed.

The laminated plates or masses described may be formed into electric accumulators or secondary batteries, either alone or in combi nation with plain plates, such as now employed.

Having thus fully described our invention, what we claim, and desire to secure by Letters Patent, is

The method of manufacturing and preparing plates for electric accumulators or secondary batteries, hereinbefore described, consisting in alternately coating and reducing saidplatcs by rolling until the desired thickness is obtained, substantially as set forth.

THOS. S. SARNEY.

J. M. ALPROVIDGE. Vitncsscs:

G. NV. \VnsrLEY, T. J. Osnan, Both of N0. 17 Gl'dlfflflltltfdlt Street, London, 

